2.8 v6 factory parts swap

[VINNY VROD]

I am building a 2.8 beretta gt and want to keep the parts stock. Are there any parts that can swap off of a later 60 degree that can improve power; cams, intake, throttle body, etc. Thanks for any assistance...

[RebelGT]

swap in a whole 3.4 liter and you'd be good to go.

[v6h.o.]

the 3100/3400 parts will work on the older engine, but it involves changing quite a few other parts.

https://www.domesticcrew.com/660

[VINNY VROD]

Do they look the same? I am actually running in a stock class and need the engine to be "stock", if you know what I mean.

[patgizz]

none of those will look stock, and you can't say, put the better genIII heads on and use your intake either.

you could swap in a 3.4L bottom end and port the crap out of your heads and intakes, extrude hone the exhaust manifolds, all kinds of things can be done.

[VINNY VROD]

I take it that the 3.4L crank will directly fit into the stock 2.8L block? I also read in hear that the rods are all the same length, is this true? Are the Fiero flat top pistons usable with the 3.4L parts? Thanks

[sharkey]

if you put a 3.4l crank in a 2.8 block, you acatualy end up with a 3.1. you would need to bore the block around double the maximum (i think its almost .120" over) to get a 3.4l. im not sure if the rods are the same leangth (i know 2.8 and 3.1 are, with different pinheights)

what you could do for the extra displacment is get a 3.1l and put the 2.8l upper plenum on it. nobody would know the differance. failing that, you could do a 2.8 block with 3.1 crank rods and pistons. and no fiero flattop pistons wont work due to the different combustion chambers. there are several companies that make aftermarket pistons.

[VINNY VROD]

Thanks for the reply! Are there any camshaft variations between the model years? I also read that the '94 3.1L made the most HP (160), should I get the parts from one of those or was there a block mod that created the extra HP. Does the 3.4L TB look the same as the 52mm TB? thanks again for the help!!

[sharkey]

the 3.1l made 140hp, the 3.4l made 160.

[VINNY VROD]

Sorry for the misread.

[bszopi]

There are 2 94s... the 3.1L (140hp) and the 3100 (160hp).

[VINNY VROD]

Are any of the parts from the 3100 compatable with the 3.1L bottom end and heads? Really not this dumb, just unfamiliar with these motors. Thanks

[bszopi]

Well, if you put the 3100 heads on the 3.1L block, then the entire top end of the engine is compatible. Check out this site, for it should answer most of your questions...

http://www.domesticcrew.com/660/

[XLR8ING]

If you need it to look stock, what you do is use the FWD 3.1 bottom end (crank), and maybe even the block (1993-94 blocks look to be the strongest of the old 3.1 styles), then use the stock pistons from a 1991 3.1 L Camaro. This gives you just over 11:1 compression with the aluminum heads, and it's been done by many guys here, so we know it works. Then port your stock aluminum heads, but don't get too crazy if you're still using a stock cam. Next get your throttle body overbored by a machinist. I believe 56mm is as big as you can go on the stock TB. And if you can afford it, have your intake manifold extrude honed.
Good luck!

[VINNY VROD]

Thank you veeerrryyy much!! That is the info I am looking for. I did some reading and found some website stating that the heads from the 1990 grand prix turbo flowed real well, is this true? I would love to be able to port and polish but I think that might be to easy to trace. thanks again.